If you have a Crown masternode, now called a Tron, you will need to update it _immediately_ now that distributed governance has been implemented.
If you are running your masternode on a linux VPS, the following code is what you need (thanks, infernoman and stonehedge!) in order to perform the update:
crown-cli stop
curl -sSL "https://github.com/Crowndev/crowncoin/releases/download/v0.12.1.0/crown-x86_64-unknown-linux-gnu.tar.gz" -o crown.tgz
sudo tar xzf crown.tgz --no-anchored crownd crown-cli --transform='s/.*\///'
sudo strip crownd crown-cli
sudo mv crownd crown-cli /usr/local/bin/
sudo rm -rf crown*
crownd
If you're not running linux, just look here for the right version for you, and replace that filename in the 'curl' command above.
Your new client wallets can be found here.
If you need more help, please ping 
Hope this helps!